CPU Shares and Process State

In the Solaris system, a project workload usually consists of more than one
process. From the fair share scheduler perspective, each project workload can be in
either an idle state or an active state. A project is considered
idle if none of its processes are using any CPU resources. This usually
means that such processes are either sleeping (waiting for I/O completion) or
stopped. A project is considered active if at least one of its processes
is using CPU resources. The sum of shares of all active projects is
used in calculating the portion of CPU resources to be assigned to projects.

When more projects become active, each project's CPU allocation is reduced, but the
proportion between the allocations of different projects does not change.